Inferray architecture inferray imports data either from les on the hard drive or to interact with the widely used jena. The semantic web implementation using native xml database as backend storage. Jena and the difference between liststatements and listobjectsofproperty. Ontologies have become a popular research topic in many communities.
Jena is a leading semantic web programmers toolkit 22. The named graphs api for jena is an implementation of named graphs on top of the jena semantic web framework. Jena supports a semantic web query language, rdql 25, that can be used either on top of materialized graphs, or on the virtual results of rdfs or owl reasoning. The heart of the semantic web recommendations is the rdf graph 20, as a universal data structure. Parsing native owl dl into executable ontologies in an object. By adding semantics we enable intelligent reasoning to be done on web. The extension of the htmlbased web was developed, and it was named the semantic web 1. Rdf datasets can be very large, and often are subject to complex queries with the intent of extracting and infering otherwise. Jena proceedings of the th international world wide web. In this paper we perform a preliminary evaluation on how semantic web technologies such as.
Rdf semantic graph support for apache jena also referred to here as support for apache jena provides a javabased interface to oracle spatial and graph rdf semantic graph by implementing the wellknown jena graph, model, and datasetgraph apis. An htmlbased web was not quite capable of this task. Robot supports automation of a wide range of ontology development tasks, focusing on obo conventions. There are several technologies, aimed at implementing the semantic web. We demonstrate automatic discovery and classi cation of personally identi able information pii in relational databases, using a classi cation model in rdfowl describing the elements to discover and classify. Jena is a java framework for writing semantic web applications. The jena api is applied to store cg owl documents in mysql, set inference rule and achieve search queries on the ontology database. Agent reasoning with semantic web in web blogs springerlink. The new semantic web recommendations for rdf, rdfs and owl have, at their heart, the rdf. Ontology as an important representation model of semantic web has valuable application. Semantic web extends the current web by adding semantics. After importation, the inference process is separated into di erent steps, depicted in figure 1, the highlights are presented as follows. It trades off time with space more space for denormalization.
Carroll and ian dickinson and chris dollin and andy seaborne and kevin wilkinson and dave reynolds and dave reynolds, title jena. Jena is a collection of java libraries used for creating semantic web and linked data applications mcbride, 2002. This paper describes a property table design and implementation for jena, an rdf semantic web toolkit. Im using jena framework to interact with my ontology and all works fine when i use some tutorials found in internet. Semantic web with java taylor cowan travelocity 8982. A design goal is to make jena property tables look like normal relational database tables. The jenabased ontology model inference and retrieval. A novel textual encoding paradigm based on semantic web tools. A communitydriven approach to development of an ontologybased application management framework. Parallel sort merge join reasoning julien subercaze 1and christophe gravier laboratoire hubert curien, umr cnrs 5516. A new ontology model on the basis of computer graphics cg knowledge is proposed, called cg ontology model. Jena implementing the semantic web recommendations pdf free. Our primary goal was to design a library for software developers that would scale well for working with large ontologies. A new ontology model on the basis of computer graphics cg knowledge is.
Proceedings of the th international world wide web conference on. It provides a framework for inferencing, storage, querying sparql and it. Carroll dave reynolds hp labs, bristol uk ian dickinson andy seaborne firstname. It is an extension of the wiki engine jspwiki with the semantic web framework jena. In this paper an application is created in eclipse using jena. Jena s query language, rdql, and the web api are both offered for the next round of standardization. Various studies for representing web information as well as reasoning to infer useful knowledge are active topics in semantic web. Genericru lereasoner requieresa rulesetto define its behaviour a set of com. An infrastructure for smart spaces they use semantic web to add the following features to a space. Carroll, ian dickinson, chris dollin, andy seaborne, kevin wilkinson and dave reynolds and dave reynolds download pdf 7 kb.
The jenabased ontology model inference andretrieval. In fact, ontology is a main component of this research. Implementing the semantic web recommendations hp labs. While a few years ago a large rdf dataset would consist of a. The new semantic web recommendations for rdf, rdfs and owl have, at their heart, the rdf graph. Jena2, a secondgeneration rdf toolkit, is similarly centered on the rdf graph. Ng4j named graphs api for jena 2 is an extension to the jena semantic web framework 9. Separate literals table is used for storing large literals. Enterprise data classi cation using semantic web technologies. The model api includes support for other aspects of the rdf recommendations, such as containers and reification. It is considered that the semantic web is a machinereadable web that is the web that can be processed by machines. Driven approach to development of an ontologybased application management framework. Our results show significant performance improvements by applying owl2 rl rule subsets, allowing.
Implementing the semantic web recommendations, booktitle, year 2003, pages 74. The challenges of sws interoperability are mainly consisting in the issues of structural and semantic heterogeneity between messages exchanged by web services and representing as syntactic. It packages common highlevel ontology development functionality into a convenient library, and makes it easy to configure, combine, and execute individual tasks in comprehensive, automated workflows. This chapter focuses on jena as a concrete example as well as our main development environment. The aim is to bring together the best of two worlds the simplicity of wiki systems and the power of semantic web technologies. Uris, literals are stored directly in the triple table. Usa abstract the new semantic web recommendations for rdf, rdfs and owl have, at their heart, the rdf graph. Pdf the new semantic web recommendations for rdf, rdfs and owl have, at their heart, the rdf. Implementing the semantic web recommendations core. Rdf is a set of standards for describing and modeling data and is the backbone of the semantic web technologies.
An rdf api statement centric methods for manipulating an rdf model as a set of rdf triples resource centric methods for manipulating an rdf model as. Rdfxml,n3,turtle,ntriples notations such as rdf schema rdfs and the web ontology language owl all are intended to provide a formal. Semantic web technologies a set of technologies and frameworks that enable the web of data. Jena jena is java toolkit for developing semantic web applications based on w3c recommendations for rdf a.
It should be reminded that the jena framework had been chosen for implementation as the swes inference engine 6. Pdf combining ontology development methodologies and semantic web platforms. Benchmarking semantic reasoning on mobile platforms. I mean, i didnt understand whats a intelligent agent proposed in the semantic web theory. Implementing the semantic web recommendations jeremy j. Carroll, dave reynolds, ian dickinson, andy seaborne, chris dollin and kevin wilkinson. Implementing the semantic web recommendations by jeremy j. Resource description framework rdf a variety of data interchange formats e. Owl web ontology language both together form a standardization for a simple triplebased representation of knowledge. Complete queries can be passed into the underlying graph layers, so databasebacked graphs can take advantage of sql optimization.
Merging of ontologies through merging of their rules. It provides support for named graphs to the popular javabased toolkit 6, and thereby enables and simplifies many of the applications mentioned above. Jena similarly has the graph as its core interface around which the other components are built. The move towards a semantic web is driving the need for efficient querying ability over large datasets consisting of statements about web resources. Browse other questions tagged jena semantic web foaf or. Using jena for development on the semantic web springerlink skip to main content. Web content consists mainly of distributed hypertext and hypermedia, and is accessed via a combination of keyword based search and link navigation. Now, id like to know how can i implement an intelligent agent for my application. Rdfs and owl reasoning are seen as graphtograph transforms, producing graphs of virtual triples. Jena a semantic web framework georgia state university.
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